RAPID: Collaborative Research: Triggered Aftershocks and Tremors following the Kaikoura Earthquake recorded with Arrays (KEA)

RAPID：协作研究：用阵列记录的凯库拉地震后引发的余震和震颤 (KEA)

• 批准号: 1725165
• 负责人: Zhigang Peng
• 金额: $ 1.89万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-02-15 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1725165&HistoricalAwards=false
• 关键词: RAPID; Collaborative; Research; Triggered; Aftershocks

This project supports the deployment a dense array of seismic arrays around the Cook Strait in New Zealand to record deep tectonic tremor and aftershocks following the M7.8 Kaikoura earthquake. This was the second largest seismic event since the European settlement in New Zealand, and it triggered deep and shallow slow-slip events along the Hikurangi subduction zone. The ongoing slow-slip events have apparently increased the probability of an M~8 megathrust earthquake in this region. Hence, this network can provide useful information on how slow-slip and tremor evolves on the megathrust following a large earthquake. This project involves international collaborations among United States, New Zealand and China, and will support a junior faculty member at UC Riverside.Four mini-arrays (each has 12 5-s flex-nodes) together with 17 short-period and broadband seismometers, will be deployed around the Cook Strait for up to one year. This hybrid network is strategically planned to complement and take advantage of the existing and planned deployment in the area to be able to have high-resolution locations of seismic events in the region. Seismic data collected during this experiment will be made available to IRIS DMC as soon as the experiment is finished. The collected seismic data can be used to understand the relationship among the M7.8 Kaikoura mainshock, ongoing afterslip, triggered slow-slip events and the accompanying tremor activities, and quantify the physical mechanisms for tremor and microseismicity.

该项目支持部署新西兰库克海峡周围的一系列密集的地震阵列，以记录M7.8 Kaikoura地震后的深层构造震颤和余震。这是自欧洲在新西兰定居以来的第二大地震事件，它引发了沿着高川俯冲带的深层慢滑态事件。正在进行的慢滑行事件显然增加了该地区M〜8兆心座地震的可能性。因此，该网络可以提供有关大地震后慢滑和震颤如何在巨型上演变的有用信息。该项目涉及美国，新西兰和中国之间的国际合作，并将支持UC Riverside的初级教师。四次迷你阵列（每个阵列（每个都有12个5-S Flex-Nodes））以及17个短期和宽带地震仪，将在厨师海峡周围部署多达一年。该混合网络在战略上计划补充并利用该地区现有和计划的部署，以便能够在该地区拥有地震事件的高分辨率位置。实验完成后，将在此实验中收集的地震数据可用。收集到的地震数据可用于了解M7.8 Kaikoura Mainshock，持续下滑，触发慢滑行事件和随附的震颤活动之间的关系，并量化震颤和微作用的物理机制。

项目成果

Large-scale dynamic triggering of shallow slow slip enhanced by overlying sedimentary wedge

• DOI: 10.1038/ngeo3021
• 发表时间: 2017-10-01
• 期刊: NATURE GEOSCIENCE
• 影响因子: 18.3
• 作者: Wallace, Laura M.;Kaneko, Yoshihiro;Fry, Bill
• 通讯作者: Fry, Bill